Connection of resistors in 2-wire configuration

For evaluating resistors, a constant current must flow through them to build the necessary voltage drop. For this, the module AI531 provides a constant current source which is multiplexed over the 4 analog channels.

The following figure shows the connection of resistors in 2-wire configuration.

1 analog sensor requires 1 channel.

The following measuring ranges can be configured AI531 Analog Input Module AI531 Analog Input Module:

Resistor

50 kOhm

1 channel used

The function of the LEDs is described under Diagnosis and displays / displays.

In order to avoid error messages from unused analog input channels, it is useful to configure them as “unused”.